.Resizer {
    box-sizing: border-box;
    background: #000;
    opacity: 0.5;
    z-index: 1;
    background-clip: padding-box;
    &.horizontal {
        height: 11px;
        margin: -5px 0;
        border-top: 5px solid rgba(255, 255, 255, 0);
        border-bottom: 5px solid rgba(255, 255, 255, 0);
        cursor: row-resize;
        width: 100%;
        &:hover {
            border-top: 5px solid rgba(0, 0, 0, 0.5);
            border-bottom: 5px solid rgba(0, 0, 0, 0.5);
        }
    }
    &.vertical {
        width: 11px;
        margin: 0 -5px;
        border-left: 5px solid rgba(255, 255, 255, 0);
        border-right: 5px solid rgba(255, 255, 255, 0);
        cursor: col-resize;
        &:hover {
            border-left: 5px solid rgba(0, 0, 0, 0.5);
            border-right: 5px solid rgba(0, 0, 0, 0.5);
        }
    }
    &:hover {
        -webkit-transition: all 2s ease;
        transition: all 2s ease;
    }
}

.vertical {
    section {
        width: 100vh;
        height: 100vh;
        display: -webkit-box;
        display: -webkit-flex;
        display: -ms-flexbox;
        display: flex;
        -webkit-box-orient: vertical;
        -webkit-box-direction: normal;
        -webkit-flex-direction: column;
        -ms-flex-direction: column;
        flex-direction: column;
    }
    header {
        padding: 1rem;
        background: #eee;
    }
    footer {
        padding: 1rem;
        background: #eee;
    }
}

.horizontal {
    section {
        width: 100vh;
        height: 100vh;
        display: flex;
        flex-direction: column;
    }
    header {
        padding: 1rem;
        background: #eee;
    }
    footer {
        padding: 1rem;
        background: #eee;
    }
}

.parent {
    width: 100%;
    height: 100%;
    -webkit-box-flex: 1;
    -webkit-flex: 1;
    -ms-flex: 1;
    flex: 1;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
}

.header {
    background: #aaa;
    height: 3rem;
    line-height: 3rem;
}

.wrapper {
    background: #ffa;
    margin: 5rem;
    -webkit-box-flex: 1;
    -webkit-flex: 1;
    -ms-flex: 1;
    flex: 1;
}